Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=false, idempotentHint=true and destructiveHint=false, so the safety profile is covered. The description adds essentially nothing beyond that: it does not say whether unspecified colors are preserved, whether preset and explicit colors conflict, or what permissions are needed. Minimum viable given the annotation coverage.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

A single sentence that front-loads the action and then the three input forms, with zero filler. Nothing could be removed without losing meaning.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 4-parameter, fully schema-documented mutation with no output schema, the description is sufficient to invoke the tool correctly, and annotations cover reversibility/idempotency. The only gap is the interaction between preset and explicit colors, which neither description nor schema disambiguates.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, including the enum of fonts, the hex pattern, and the preset id list, so the schema does the heavy lifting. The description only mirrors those three parameter groups and adds no precedence or format detail (e.g. what happens when preset and colors are both supplied). Baseline 3 applies.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names a specific verb ("Muda") and resource ("as cores e a fonte do tour") and enumerates the three ways to do it (preset, colors #RRGGBB, font). It is instantly distinguishable from siblings like set_end_cta or set_translation, though it makes no explicit sibling comparison.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is only implied: it is clear you call this when you want to restyle a tour, but there is no statement of when to prefer a preset vs raw colors, no prerequisites, and no exclusions. The "e/ou" hints that the three inputs are combinable, which is the only real guidance given.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.